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https://issues.apache.org/jira/browse/HIVE-9243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14264004#comment-14264004
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Brock Noland commented on HIVE-9243:
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I see. I will remove the synchronization and add some comment saying that spark
is the only engine which is multi-threaded and thus it uses the threadlocal.
> Static Map in IOContext is not thread safe
> ------------------------------------------
>
> Key: HIVE-9243
> URL: https://issues.apache.org/jira/browse/HIVE-9243
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.15.0
> Reporter: Brock Noland
> Assignee: Brock Noland
> Attachments: HIVE-9243.patch, HIVE-9243.patch
>
>
> This map can be accessed by multiple threads. We can either map it a
> {{ConcurrentHashMap}} or synchronize the calls to this class.
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